Heavy rain fell overnight across the Seoul metropolitan area and Gangwon Province as the remnants of tropical storm Bobi moved eastward [1].

The sudden deluge threatens infrastructure and public safety across multiple provinces, with officials warning of continued strong winds and high sea waves through Wednesday afternoon [1, 2].

Rainfall totals were highest in the capital region. Seoul's Gangbuk-gu recorded 132 mm [1], while Namyangju in Gyeonggi Province saw 117 mm [1]. In the east, Hwacheon in Gangwon Province recorded approximately 103 mm [1].

Intensity varied by location. Incheon's Ganghwa district experienced a peak of 56 mm per hour, and Paju recorded 51 mm per hour [1]. Other affected areas reported typical hourly rainfall between 30 and 40 mm [2].

"During the night, heavy rain poured down, centered on the metropolitan area and Gangwon," said YTN reporter Ko Han-seok [1].

The weather system, classified as an extratropical low, brought strong rain clouds and gusty winds as it shifted east [2, 3]. While the heaviest rain has begun to lessen in some areas, scattered showers are expected to persist [1, 2].

"Strong rain and gusts of 30 to 40 mm per hour are continuing in various places," said YTN reporter Kim Min-kyung [2].

An anchor for YTN said that occasional rain will continue across the country until this afternoon [1].

“Seoul's Gangbuk-gu recorded 132 mm”

The transition of tropical storm Bobi into an extratropical low demonstrates how lingering moisture from storm systems can trigger localized, high-intensity rainfall even after a storm's primary peak. The concentration of over 100 mm of rain in multiple provinces within a single overnight window increases the risk of urban flooding and landslides in mountainous regions like Gangwon.